When comparing Nirvanahq vs Simpletasks Dropbox, the Slant community recommends Nirvanahq for most people. In the question“What are the best GTD apps?” Nirvanahq is ranked 3rd while Simpletasks Dropbox is ranked 18th.
Ranked in these QuestionsQuestion Ranking
Pro Solid project management
Pro Allows setting how much effort a task will take
You can set how long a task will take and how much effort will it ask of you on a scale of 1 to 3.
Pro Allows adding items via email
Pro Use start dates
A vital functionality in a GTD app.
Pro Beautiful interface
Clean, intuitive user interaction. The design is very thoughtful. Somehow it makes Things feel clunky, despite obvious similarities of all GTD platforms.
Pro Allows to add postponed tasks
You can postpone a task. It helps not to clutter task lists up until you really need them.
Pro Beautiful interface
Clean, intuitive interface — both desktop and mobile. Lots of intelligent design thinking behind this. Somehow makes other GTD apps like Things feel clunky, despite similarities.
Pro Native support for Areas of Responsibility
Pro Can email focus list
The app can send you the most important items for the day in an email.
Pro 100% Free
Just like todo.txt cli, this is 100% free (although donations are accepted).
Pro Also comes in a cloudless an Owncloud version
For those who don't care about syncing there is a cloudless version while people who run Owncloud may opt for the Owncloud version.
Pro There is an add to calendar button
This not only tells one's calendar (and thus any devices that sync with your calendar) about the todo, but allows all synced calendars to play an audible alarm when the todo is scheduled to be finished.
Pro Seemless compatibility with todo.txt cli
Let's one sort to-dos by due date then priority
Con Does not integrate with other apps or services
Con No way to add sub-projects
Con No way to work with teams
This is a one-person solution, there is absolutely no ability to share projects with others.
Con No way to color-code projects
Con No desktop widget
Con No bulk (copy/paste) feature
Con Limited features in the free version
Free version limited to 5 projects, 3 reference lists and 2 areas.
Con No attachments
Can't add any attachments to the tasks - no photos, no pdfs.
Con No recur upon completion option
If you have a daily recurring task, it will recur every day regardless if it's been completed the prior day.
Con Must use DropBox service
Con As far as I know this app is Android only
I believe Simpletasks is an Android only app.